27 April 2016 Supercontinuum generation in polarization maintaining photonic crystal fiber by using various harmonics of sub-nanosecond Q-switched laser
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Abstract
We present results of supercontinuum generation in highly nonlinear polarization maintaining photonic crystal fiber using various harmonics of sub-nanosecond passively Q-switched Nd:YAG microlaser. The pump source was a Nd:YAG microlaser generating 50 μJ energy 300 ps duration pulses at 1064 nm with kilohertz repetition rate. We demonstrated that we can expand the supercontinuum spectrum to cover the whole visible range and beyond using either first or second harmonic of our pump laser in simple experimental setups: supercontinuum extended from 400 nm to 1300 nm in case of λp = 1064 nm and from 400 nm to 900 nm in case of λp = 532 nm. We compared supercontinuum evolution and dependence on pump pulse energy in both cases. We also performed numerical simulations of supercontinuum generation in PCF by applying the traditional approach of solving generalized nonlinear Schrödinger equation (GNLSE) and also presented a new numerical simulation approach -deriving and solving equation for evolution of spectral components of pulse propagating in the PCF. In case of GNLSE approach, the simulated supercontinuum spectra display the same qualitative features as the ones measured in the experiment.
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Julius Vengelis, Julius Vengelis, Vygandas Jarutis, Vygandas Jarutis, Valdas Sirutkaitis, Valdas Sirutkaitis, "Supercontinuum generation in polarization maintaining photonic crystal fiber by using various harmonics of sub-nanosecond Q-switched laser", Proc. SPIE 9894, Nonlinear Optics and its Applications IV, 98941C (27 April 2016); doi: 10.1117/12.2227322; https://doi.org/10.1117/12.2227322
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